This is something I never figured out how to do.  How do you
supplement an OR statement in datastore?

So let's say I have a user who sells Dogs and Cats.  How do I get a
list of all of the dogs and cats that a user sells? I thought of 2
ways, query both tables and combine the results in the backend or
create an additional generic table Animals that tabulates all of the
selling action into a list and search the Animals entries for that
user.

I created this scenario just so you can have an idea of what I am
looking for, but in reality, my "cats" table may consist of hundreds
of users.  I'm not sure if creating a combined list property of Dog
and Cat users is the way to go.  And doing two queries just doesn't
seem right either.  Is there a better way to do this?

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